▎ 摘　　要

NOVELTY - Preparation of three-dimensional bulk graphene-based cobalt-based metal organic framework (MOFs) composite material comprises dissolving 20 mg graphene oxide in 10 mL deionized water, performing ultrasonic dispersion for 4-8 hours to obtain 2 mg/mL graphite (GO) liquid hydrosol, dissolving cobalt nitrate in methanol solution, adding methanol solution containing 2-methylimidazole to obtain uniform purple solution, standing purple solution at room temperature for 20-30 hours, washing with methanol and deionized water, freeze-drying to obtain cobalt-based MOFs material zeolitic imidazolate framework (ZIF)-67, dispersing 1-5 mg ZIF-67 in 2 mg/mL GO hydrosol, mixing, performing ultrasonic dispersion, reacting at 160-200 degrees C for 20-30 hours, washing with deionized water and drying in oven at 40-50 degrees C for 5-8 hours. USE - Method of preparing three-dimensional bulk graphene-based cobalt-based metal organic framework composite material used for reducing 4-nitrophenol in sodium borohydride (claimed). ADVANTAGE - The method has simple preparation and is easily recycled and environment-friendly.